The nominal compressive strength of a strut
, shall be calculated by (a) or (b):
(a) Strut without longitudinal reinforcement
(b) Strut with longitudinal reinforcement
|Fns = fceAcs+ A'sf's
where Fns shall be evaluated at each end of the strut and taken as the lesser value; Acs is the cross-sectional area at the end of the strut under consideration; fce is given in 23.4.3; A's is the area of compression reinforcement along the length of the strut; and f's is the stress in the compression reinforcement at the nominal axial strength of the strut. It shall be permitted to take f's equal to fy for Grade 40 or 60 reinforcement.